Multiple ecological mechanisms drive effects of fertilization and herbivore exclusion on species richness in an alpine grassland community - Wei Zhao; Shaohao Bang; Zhenzhen Pan; Ruibing Wang; Huan Chen; Xiaolong Zhou; Defei Liang; Honglin Li; Ning Chen; Shiting Zhang; Zhengwei Ren (Agriculture, Ecosystems & Environment, 2026)